C: (over intercom) 'Hello, this is your Captain speaking. There is absolutely no cause for alarm.' That will get them thinking.

(First Officer reaches for the microphone.)

C: No, no, no, no. Not yet, not yet. Let it sink in. They will be thinking, er, 'What is there absolutely no cause for alarm about? Are the wings on fire? (over intercom) 'The wings are not on fire.' Now they are thinking, er, 'Why should he say that? So we say...